Okay, the user wants me to translate "triangular patterns" into Traditional Chinese. Let me check the rules again. The first rule says to translate all content into Traditional Chinese. The second rule states that if the content is already in Traditional Chinese, leave it as is. The third rule is to provide only the translation without any explanations.
First, I need to confirm whether "triangular patterns" is already in Traditional Chinese. The original term is in English, so it's not. Next, I need to translate it accurately. The word "triangular" translates to "三角" in Chinese, which is the same in both Simplified and Traditional. "Patterns" would be "圖案" in Traditional Chinese. So combining them, it should be "三角圖案".
I should double-check if there's a more common term used in Traditional Chinese contexts. Sometimes, technical terms might have specific translations. However, "三角圖案" seems correct. There's no need for additional explanations as per the user's instruction. Just output the translation.